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(No Model.) 3 Sheets-Sheet 1. G. H. SELLERS & W. MALAM.

STEAM BOILER.

No. 372,572. Patented Nov. 1, 1887.

INVENTORS N. PEYERS4 Plmiu-Llllmgraplwr. Washmglan. a. c.

(No Model.) 3 Sheets-Sheet 2. G. H. SELLERS & W. MALAM.

STEAM BOILER.

FIG. 2.

INVENTORS. 420 w,

WITNESSES.

, I yrm N. PLIERS. Phom-Lilhagraphur. Washington. a. c

(No Model.) I 3 Sheets- Sheet 3. G. H. SELLERS & W. MALAM'.

STEAM BOILER. N0. 372,572. Patented NOV. 1, 1887.

WITNESSES. INVENTORS.

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UNrTnn STATES GEORGE H. SELLERS, OF RIDLEY PARK, PENNSYLVANIA, AND \VILLIAM MALAM, OF EDGE MOOR, DELAWARE, ASSIGNORS TO THE EDGE MOOR IRON COMPANY, OF NEW CASTLE COUNTY, DELAYVARE.

STEAM-BOILER.

fiiPECIPICATION forming part of Letters Patent No. 372,572, dated November 1, 1827.

Application filed July 8, 1887. Serial No. 243,799.

T0 at whom it may concern.-

Be it known that we, Gnonen H. SELLERS, a citizen of the United States, residing at Ridley Park, in the county of Delaware and State of Pennsylvania, and (VILLIAM MALAM, an English subject. residing at Edge Moor, in the county of New Castle and State of Delaware, have jointly invented certain Improvements in Internally-Fired Steam-Boilersot' which improvements the following is a specification, reference being had to the accompanying drawings, forming part of this specification, in which Figure 1 represents a verlical longitudinal section through the centerot' the line of a Galloway boiler embodying our improvements. Fig. 2 is a vertical crosssection of the same on the line A B, Fig. 3. sight being toward furnace end; and Fig.3 is a horizontal cross-section of the same boiler, showing the exterior of the flue and its two furnaces.

As these improvements relate more particularly to what is known as the Galloway boiler, for which boiler patents of the United States, numbered, respectively, 180,863 and 253,365, were issued August 8, 1876, and February 7, 1882, the drawings represent this form of boiler; but our improvements are applicable to any boiler having conical vertical water-tubes in a horizontal internal flue. A marked characteristic of the Galloway boiler is the long combustion chamber or flue common to its two furnaces, which chamber is provided with conical vertical water tubes so placed that every part of its interior is accessible for examination and repair, while the exterior is so shaped to afford space for a like purpose between the fine and the outer shell of the boiler.

In the construction of this boiler, the internal flue, which contains the vertical watertubes,has been heretofore composed of a series of zones united at their ends by circumferential seams of rivets. Each zone was formed of four plates, bent transversely to the plate, to conform to the shape of a transverse section of the due and united at their ends by four longitudinal seams of rivets, so that the flue was, like the exterior shell of the boiler, provided with longitudinal and circumferen- (No model.)

tial seams of rivets; and, thus constructed, the zones determined the number and position of the vertical tubes, as it was necessary that the flanges of the tubes should not overlap the rivet-seams which united the zones, while the requirement of accessibility to all parts of the interior limited location in that direction. The top and the bottom ot'this llue aresegments of a circle struck from a common center below the fine, and the two sides are hemispherical. The circumferential rivet-seams strengthened the hemispherical plates to resist the tendency to collapse under the external pressure to which they were subjected in service; but, even thusstrengthened, these sides were the weakest part ot the line, while the number-of plates which composed the whole flue rendered its construction both ditlicult and expensive.

In forming the hemispherical sides of the 0 fine it has been the usual practice heretofore to construct two or three pockets in each side, the longitudinal axis across the line, and with circular or oval outline on this axis, which pockets projected toward the vertical water- 7 tubes to obstruct the direct outflow ot' the products of combustion along the outer sides of the rows of vertical water tubes. Although badly formed for the purpose, these pockets served also to increase, to a small extent, the area of water-circulation between the outside of the flue and the inside of the boiler-shell; but,notwithstanding this increased area,it has been found desirable to reduce the width of this due below that of the two circular fur- 8 naces with which it is connected, to provide sufficient area for the circulation of the water, and this renders the connection with the furnaces more diiiicult than it would be if the Width of the tlue and the furnaces were the 0 same.

It is the object of our invention to simplify the construction of the internal tlue for such boilers, to increase its width and at the same time to increase the area for water-circulation 5 around it, to decrease the space for the direct outflow of the products of combustion, to

equalize its strength and add to its heatingsurface; and to these ends our invention con sists in an internal boiler-flue composed of four rco I length.

plates united by longitudinal rivet-seams without intermediate circumferential rivetseams and provided with conical vertical water-tubes; and it further consists of an internal boiler-flue, without intermediate circumferential riv'etseams, and provided with conical vertical water-tubes and hemispherical sides corrugated conformably with the longitudinal spacing of the outer rows of such vertical tubes.

In order to show clearly the means employed to accomplish the objects we sought to attain, we refer now to Fig. 1 of the drawings, which represents a vertical section through the longitudinal axis of a Galloway boiler be tween its two furnaces, in which 0 is one of the furnaces, as seen from its exterior. D D is the combustion chamber or flue, and EE E are the conical vertical water tubes. It will be observed that these watertubes have their upper flanges above the top plate, F, of the flue, which plate extends the whole length of the flue,and that their bottom flanges are above the bottom plate, G, which also extends the whole length of the flue. To accomplish this the water-tube is made conical, the outside of the up per end having the same diameter as the flange of the lower end. The arrangement of the tubes can be seen in Fig. 3; and it must be noted that there is no room between the upper flanges of any row of tubes for a rivetseam such as would be required if this flue had been constructed of zones of plates united by circumferential seams, as heretofore.

As shown, the vertical tubes are evenly spaced throughout the flue, as heretofore, in each-zone; but the loss of space between the zones is avoided, which may be utilized to increase the number of tubes about ten per cent; or the spzzccs between the tubes may be increased to render the interior more convenient of access.

The direction anddepth of the corrugations in the side plates, H H, are shown in Fig. 2; the outline in the longitudinal axis is straight to facilitate the water-circulation, and the spacing or distance from center to center is shown in Fig. 3, as also the shape of their cross-seetion, which is represented by dotted lines. These side plates are, like the top and bottom plates, the full length of the flue; but before they are corrugated they are longer. After corrugation they are trimmed to the' proper The uniform spacingof the vertical tubes enables us to corrugate the side plates with one set of dies, which could not be done if the spacing of the tubes were irregular, as

heretofore, because the corrugations must conform to the position of the vertical tubes in the outer rows, to afford the necessary room for examination and repair when required. All of the plates F G H H are bent to the proper curvature, as shown in Fig. 2, and the top and bottom plates are punched to receive the vertical tubes. The four plates are then riveted together at the'fourlongitudinal seams a a a a, after which the vertical tubes are riveted in place, as heretofore. As thus constructed the number of rivets required for a flue is reduced about twenty-two per cent. \Vhile the fitting is greatly simplified, the width of the flue-that is to say, the largest lateral dimension-can be made equal to that of the two furnaces, whilethe deep and wide corrugations will afford increased room for water -cireulation between the flue and the outer shell of the boiler, and at the same time decrease the space for thedireet outflow of the products of combustion. They will also add very materially to the strength of the hemispherical sides of the flue,hcretofore its weal:- est part, while they make an important addi tion to their heating-surface and render their exterior and the interior of the outer shell more accessible than heretofore without impairing in this particular the interior of the flue.-

Having thus described our invention, what we claim as new, and desire to secure by Letters Patent, is-

1. An internal boiler-flue composed of but four plates, united bylongitudinal rivet-seams without intermediate circumferential rivetseams, and provided with conical vertical water-tubes, substantially as described.

2. An internal boiler-flue provided with conical vertical water-tubes and hemispherical sides, saidsides corrugated conformably with the longitudinal spacing of the outer rows of such vertical tubes, substantially as and for the purposes set forth.

3. An internal boilerflue composed of but our plates, united bylongitudinal rivet-seams rt h out intermediate circumferential rivetseams, and provided with conical vertical water-tubes and hemispherical sides, said sides corrugated conformably with the longitudinal spacing of the outer rows of such vertical tubes, substantially as and for the purposes set forth.

GEO. H. SELLERS. WM. MALAM. Witnesses:

F. W. HEISLER, H. H. CAMPBELL. 

